Reverse attachment-plug.



H. HUBBELL.

' REVERSE ATTACHMENT PLUG.

APPLIOATTON FILED FEB. 25; 1910.

Patented June 6, 1911 2 SHEETS-SHEET 1.

WITNESSES: 3Q

ATTORNEY H. HUBBELL. REVERSE ATTACHMENT PLUG. APPLIOATION FILED FEB. 25, 1910.

994,516, Patented June 6,1911. 1 a sums-sum 2. I

In I

' INVENTOR ATTRNEY WITNESSES:

' To all whom it may concern: 7

. the members 0 UNITED STATES PATENT o FioE.

. HARVEY HUBBELL, 03E BRIDGEPORT, CONNECTICUT.

REVERSE ATTAcHMENT-PEUG.

Be it known that I, HARVEY HUBBELL, a citizen of the United States, residing at Bridgeport, county of Fairfield, State of. onnecticut, have invented an Improvem t in Reverse Attachment-Plugs, of which the following is a specification.

This invention has for its object to provide what I term a reverse attachment plug especially adapted for various uses in Which the dead memberof the plug is located in a base, or other receptacle, as the base of a motor, a vacuum cleaner or a fan, and the invention has-for its object to produce an attachment plu of this character in which the plug which I term for convenience the live and dead members are reversed; that is to say, the projecting contacts which have heretofore been carried by the live member shall be carried by the dead member and shall be wholly covered and protected by the walls of [the receiving socket in the base, the contact springs which have heretofore been placed in the dead member being in my novel reverse plug placed in the live member. The term live member will of course be understood to mean the current carrying or live member and the dead membento mean. the current receiving or machine member. And the invention furthermore has for its object to provide an attachment plug of'this character which shall be so constructed that the bodies of the members maybe made from relatively inexpensive hard rubber composition, .so called, which will not stand a high degree of heat and the contact springs and contact plates respectively. shall be insulated from each other and from the'body members by means of insulating-plates of fiber or other suitable insulatin material. v

b With these an other objects in view I novel reverse attachment connection with the accompanying, drawings is a? specification, reference characters being used toindicate the several arts.

Flgure 1 is a plan view, art y broken away, showing the members 0 my novel attac ent plug connected; Fig. 2 a corre; sponding elevation partly in vertical sec- Specification of Letters Patent. Application filed February 25, 1910. Serial No.

' tors.

perspectives of the .and Fig. 9 is a section of a base with the dead member in place therein in elevation and the live memberin position to make a connection. I I 20 denotes a base which may be of any required configuration and is provided with acasing 21 to receive the members in the connected position and to cover and protect the contacts when making a connection and with a hole or holes through which electric conductors 22 pass. The dead member,

Patented June 6, 1911.

dead and live memwhich is indicated as a whole by 23, is

shown as secured in the casing by means ofa bolt'24 which passes through the casing and through the member. The member comprises a base 25 and a cap 26. Both base and cap may be made of any inexpen= sive material as ordinary hard rubber composition, so called.

.2? denotes the contacts which may be of any ordinary or preferred construction and are rigidly secured to relatively thin insulating plate 28 which may be made of fiber or any suitable relatively stronger insulating material and is .rigidly secured to the base. l

to which conductors 22 are connected.

'Boththe base and with-suitable recesses 30 to snugly receive the 'contacts, insulating 31 denotes the 'live member as a whole which comprises a base 3 2 and a cap 33. I have shown the base and cap as provided 29 denotes bindingscrews in the contacts the cap are provided plates and conducwith a hub' 34 which receives the endof a cable 35 containing conductors indicated by 36 and is concaved to form a grip for the hand of the operator a connection.

37 denotes the contact springs and 38 the locking springswhich are secured to in making or breaking v plates 39 themselves secured to a relatively thin insulating plate 46 which in turn is rigidly secured to the base. Plate &

\Y to which conductors 36 are connected.

1 cesses 42 which receive the conductors,

The base and cap are provided with replates 39, the insulating plate and the contact and locking springs.

It will of course be obvious that the shape or contour of the members and the special style of contacts and locking springs employed are wholly immaterial so far as the present invention is concerned. I have shown the contacts as'provided with beveled ends, indicated by 43, and with locking notches 4:4 to receive locking projections 4-5 on the locking springs, and have shown the free ends of the contact springs as're curved and extending backward parallel With each other to provide am le parallel contact surfaces with contacts 2 The operation will be obvious from the drawing.

The dead member is permanently secured in the inner end of the casing which is made long enough to receive both members where connected, leaving the contacts inclosed and covered so that they cannot come in contact with the hand of the operator in making a connection, thus avoiding the danger of the operator receiving a shock. Contact is efiected by pressing the live member into full connection with the dead member, that is until the contacts have passed between the contact springs and the locking springs have en-' gaged the locking notches in the contacts. By providing insulating plates 28 and 4:0 in the members to which the contact springs and contacts are respectively attached I insure perfect insulation, avoid all danger of sparking in making and breaking the contact and enable the bases and caps of the members to be made of relatively inexpensive material as they are effectually protected by the insulating plates from the electric circuit. Having thus described my invention, I claim: l r 1. In an attachment plug of the character described, a contact member comprising a base of insulating material having a recess therein, a sheet of relatively stronger insulating material fitting within said recess,

means for securing said sheet to said base, spaced apart contacts rigidly secured to said sheet, and a cap constructed to cover said base. i

2. In an attachment plug of the character described, a contact member comprising a base of insulating material having a recess therein, a thin sheet of relatively stronger insulating material fitting within said recess, meansfor securing said sheet to said base, and contact springs rigidly connected to said sheet of stronger said recess being provided'with an offset portion to receive said springs, whereby the latter are wholly inclosed within said base, a cap for said base and electrical connections for said contact springs.

3. In an attachment plug of the character described, a contact member comprising a base of low grade insulating material havinga recess therein, a thin sheet of relatively stronger insulating material fitting within said recess, means for securing said sheet to said base, contact springs rigidly connected to said sheet, said recess being provided with an ofl'set portion to receive said springs, whereby the latter are wholly inclosed within said base, a cap for said base, andelectrical connections for said contact springs, said base and cap being provided with complemental curved extensions forming a concaved gripping hu In testimony whereof I aflixmy signature in presence of two witnesses.

HARVEY I-IUBBELL.

Witnesses: I S. W. ATHERTON,

A. M; Wooscrnn.

insulating material, 

